19. Chemical Thermodynamics
Entropy Calculations
52PRACTICE PROBLEM
Lead oxide can be reduced by carbon (graphite) to produce lead metal and carbon dioxide. Determine the temperature at which this reaction is spontaneous.
2 PbO(s) + C(s, graphite) → 2 Pb(s) + CO2(g)
ΔH° (kJ/mol) S° (J/mol•K) ΔG° (kJ/mol)
PbO(s) –217.3 68.70 –187.9
C(s. graphite) 0 5.69 0
Pb(s) 0 68.85 0
CO2(g) –393.5 213.6 –394.4
Lead oxide can be reduced by carbon (graphite) to produce lead metal and carbon dioxide. Determine the temperature at which this reaction is spontaneous.
2 PbO(s) + C(s, graphite) → 2 Pb(s) + CO2(g)
ΔH° (kJ/mol) S° (J/mol•K) ΔG° (kJ/mol)
PbO(s) –217.3 68.70 –187.9
C(s. graphite) 0 5.69 0
Pb(s) 0 68.85 0
CO2(g) –393.5 213.6 –394.4